Yes, it is the source and summit of the Christian life, this is talked about in paragraphs 1324-1327 in the Catechism of the Catholic Church, in which the Catechism is quoting from Lumen Gentium of the Second Vatican Council.
from The Catechism of the Catholic Church, second edition, English translation 19941324 The Eucharist is "the source and summit of the Christian life." (Lumen Gentium 11 "The other sacraments, and indeed all ecclesiastical ministries and works of the apostolate, are bound up with the Eucharist and are oriented toward it. For in the blessed Eucharist is contained the whole spiritual good of the Church, namely Christ himself, our Pasch."137
The heart of the Christian service is extending God's love to the world by introducing people to Jesus Christ and how he died for the sins of the world so that those who believe in Jesus as the Son of God can have life that never ends in heaven. All other ministries and services are centered around this by further showing others that God is love.
Roman Catholic Answer: The "Christian Service" in the Catholic church usually refers to the Sacrifice of the Mass (the Eucharist). The heart of which is Jesus dying on the cross for us, and offering His Body and Blood in Holy Communion to us. Jesus is actually, physically present on the altar at Mass, and actually physically present in the Holy Communion, this is called transubstantiation.
Jesus left three things for His disciples to do:
1. make disciples. 2. baptize new disciples. 3. take bread and wine to remember Him.
Taking the bread and wine is probably the heart of Christian faith it is a time to remember Christ's death on the cross as a sacrifice for sin.
Eucharist/Communion
The Eucharist.
Because it is a person, THE person. Our Lord and Savior Jesus Christ. No Christ, no anything.
Some timeless but modern Christian worship songs are:Here I am to WorshipAncient of DaysHow Great is our GodAmazing GraceBlessed be Your NameThe Heart of Worship
The Eucharist is the central worship of Catholicism.
The first celebration of the Eucharist is believed to have taken place during the Last Supper, which was a Passover meal shared by Jesus and his disciples. Jesus instituted the Eucharist by offering his disciples bread and wine, saying, "this is my body" and "this is my blood." The Eucharist has since been celebrated as a central sacrament in Christian worship.
The Eucharist
We begin the celebration of the Eucharist with the Introductory rites. The introductory Rite is a celebration of the Eucharist, it is important to get a feeling that there is a community coming together to pray. At the beginning of the Eucharist we prepare to worship god. Hope this helps :)
Christian Initiation
The Liturgy of the Hours
The Church's greatest sacrament, the source and summit of her worship, is the Eucharist.
eucharist
The Divine Liturgy or Eucharist is the main form of Orthodox worship. It is similar to the Mass of the Roman Catholics.
Mechanical instruments are acceptable in Christian worship.